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Abstract

In a drum configuration using an incrementing photoconductor (PC), developer mix beads can work themselves into the drum past the seal and randomly be advanced onto the surface of the drum underneath the PC, resulting in a copy quality service call. (Image Omitted) Strip magnets placed next to the surface seals have been used to alleviate this problem. An improvement in the incrementing drum configuration is described which further reduces the problem. In an incrementing drum configuration (see figure) unused PC 10 is advanced from supply spool 11 past seal 12 around rotating drum 13 and back into the drum onto take-up spool 14 as used PC. In the normal configuration, the direction of the PC travel is the same as the rotating drum.

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United States

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English (United States)

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Configuration for Containing Mix Beads in a Photoconductor Drum

In a drum configuration using an incrementing photoconductor (PC), developer
mix beads can work themselves into the drum past the seal and randomly be
advanced onto the surface of the drum underneath the PC, resulting in a copy
quality service call.

(Image Omitted)

Strip magnets placed next to the surface seals have been used to alleviate this
problem. An improvement in the incrementing drum configuration is described
which further reduces the problem. In an incrementing drum configuration (see
figure) unused PC 10 is advanced from supply spool 11 past seal 12 around
rotating drum 13 and back into the drum onto take-up spool 14 as used PC. In
the normal configuration, the direction of the PC travel is the same as the rotating
drum. In the improved configuration, PC 10 is designed to travel in a direction
counter to the drum rotation. As illustrated in the figure, the natural tendency due
to this rotation is for the mix beads 15 to deposit in the nip between PC 10 and
take-up spool 14 where they are trapped and have no affect on copy quality.
Magnetic strips can be used, if desired, to increase the probability of trapping
stray mix beads.